On Tue, 2019-11-19 at 09:34 -0800, James Smart wrote: > Although... num_possible_cpus() shouldn't change, but I guess a cpu > id > can be greater than the possible cpu count. > > But there is this as well - also from include/linux/cpumask.h: > * If HOTPLUG is enabled, then cpu_possible_mask is forced to have > * all NR_CPUS bits set, otherwise it is just the set of CPUs that > * ACPI reports present at boot. That's probably an x86'ism... on powerpc the mask is set based on what's really possible and it may not be all bits Cheers, Ben.
